The following bacterial species are all implicated in dental caries EXCEPT :

The following bacterial species are all implicated in dental caries EXCEPT
 
  A) Fusobacterium.
  B) Borrelia.
  C) Streptococcus.
  D) Lactobacillus.

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Decalcification of the tooth enamel due to the production of high concentrations of organic acids in the mouth is known as
 
  A) degenerative plaque.
  B) dental caries.
  C) dental plaque.
  D) microbial enamel decalcification.

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Following antibiotic therapy, patients are often administered ________ to facilitate recolonizaton of normal flora.
 
  A) fluoride
  B) iron
  C) probiotics
  D) antivirals

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One microenvironment of the skin is an area where glands produce an oily substance called
 
  A) mucus.
  B) sebum.
  C) fimbrae.
  D) lipid A.

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Which of the following is NOT a subunit of lipopolysaccharide (LPS)?
 
  A) O-specific polysaccharide
  B) lipid A
  C) core polysaccharide
  D) M protein